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Abstract

Powder coating compositions are comprised of particles having a diameter of from about 20 μm to about 250 μm comprising: (1) a hydroxyl- and/or carboxyl-terminated polyester having a number average molecular weight of from about 1000 to about 6000 and a dynamic shear viscosity of less than 5000 cPs; (2) from about 1% to about 50% by weight of the polyester of a cross-linking agent capable of reacting with the terminal groups of the polyester and wherein the powder coating composition has a density of from about 0.95 g/cm³ to about 1.8 g/cm³. These compositions cure rapidly and provide coatings having superior physical-mechanical properties. The powder coating compositions can be applied by various methods but are particularly useful for thermal spray application methods.

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